Fig. 4

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Basic idea of the present paper. Left panel: bolometric X-ray source luminosity Leqpair (in units of 1038 erg s−1) of Fig. 2 is shown versus the EUV irradiation from the X-ray source (EFE in units of 2 × 1036 erg s−1 at 100 eV; solid line). Around it, Lrad is variable and two positions are shown (dashed lines). When Lrad − Leqpair = ϵ is positive, the evolution goes upward, “UP” (1-2-3, positive feedback), when negative it goes downward, “DOWN” (4-5-6, negative feedback). Right panel: zoomed version of the panel on the left.
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